#region

using System;

#endregion

namespace TvdbLib.SharpZipLib.Zip.Compression
{
    /// <summary>
    ///     This class contains constants used for deflation.
    /// </summary>
    public class DeflaterConstants
    {
        #region Fields

        /// <summary>
        ///     Set to true to enable debugging
        /// </summary>
        public const bool DEBUGGING = false;

        /// <summary>
        ///     Sets internal buffer sizes for Huffman encoding
        /// </summary>
        public const int DEFAULT_MEM_LEVEL = 8;

        /// <summary>
        ///     Internal compression engine constant
        /// </summary>
        public const int DEFLATE_FAST = 1;

        /// <summary>
        ///     Internal compression engine constant
        /// </summary>
        public const int DEFLATE_SLOW = 2;

        /// <summary>
        ///     Internal compression engine constant
        /// </summary>
        public const int DEFLATE_STORED = 0;

        /// <summary>
        ///     Identifies dynamic tree in Zip file
        /// </summary>
        public const int DYN_TREES = 2;

        /// <summary>
        ///     Internal compression engine constant
        /// </summary>
        public const int HASH_BITS = DEFAULT_MEM_LEVEL + 7;

        /// <summary>
        ///     Internal compression engine constant
        /// </summary>
        public const int HASH_MASK = HASH_SIZE - 1;

        /// <summary>
        ///     Internal compression engine constant
        /// </summary>
        public const int HASH_SHIFT = (HASH_BITS + MIN_MATCH - 1)/MIN_MATCH;

        /// <summary>
        ///     Internal compression engine constant
        /// </summary>
        public const int HASH_SIZE = 1 << HASH_BITS;

        /// <summary>
        ///     Internal compression engine constant
        /// </summary>
        public const int MAX_DIST = WSIZE - MIN_LOOKAHEAD;

        /// <summary>
        ///     Internal compression engine constant
        /// </summary>
        public const int MAX_MATCH = 258;

        /// <summary>
        ///     Internal compression engine constant
        /// </summary>
        public const int MAX_WBITS = 15;

        /// <summary>
        ///     Internal compression engine constant
        /// </summary>
        public const int MIN_LOOKAHEAD = MAX_MATCH + MIN_MATCH + 1;

        /// <summary>
        ///     Internal compression engine constant
        /// </summary>
        public const int MIN_MATCH = 3;

        /// <summary>
        ///     Internal compression engine constant
        /// </summary>
        public const int PENDING_BUF_SIZE = 1 << (DEFAULT_MEM_LEVEL + 8);

        /// <summary>
        ///     Header flag indicating a preset dictionary for deflation
        /// </summary>
        public const int PRESET_DICT = 0x20;

        /// <summary>
        ///     Identifies static tree in Zip file
        /// </summary>
        public const int STATIC_TREES = 1;

        /// <summary>
        ///     Written to Zip file to identify a stored block
        /// </summary>
        public const int STORED_BLOCK = 0;

        /// <summary>
        ///     Internal compression engine constant
        /// </summary>
        public const int WMASK = WSIZE - 1;

        /// <summary>
        ///     Internal compression engine constant
        /// </summary>
        public const int WSIZE = 1 << MAX_WBITS;

        /// <summary>
        ///     Internal compression engine constant
        /// </summary>
        public static int[] COMPR_FUNC = {0, 1, 1, 1, 1, 2, 2, 2, 2, 2};

        /// <summary>
        ///     Internal compression engine constant
        /// </summary>
        public static int[] GOOD_LENGTH = {0, 4, 4, 4, 4, 8, 8, 8, 32, 32};

        /// <summary>
        ///     Internal compression engine constant
        /// </summary>
        public static int MAX_BLOCK_SIZE = Math.Min(65535, PENDING_BUF_SIZE - 5);

        /// <summary>
        ///     Internal compression engine constant
        /// </summary>
        public static int[] MAX_CHAIN = {0, 4, 8, 32, 16, 32, 128, 256, 1024, 4096};

        /// <summary>
        ///     Internal compression engine constant
        /// </summary>
        public static int[] MAX_LAZY = {0, 4, 5, 6, 4, 16, 16, 32, 128, 258};

        /// <summary>
        ///     Internal compression engine constant
        /// </summary>
        public static int[] NICE_LENGTH = {0, 8, 16, 32, 16, 32, 128, 128, 258, 258};

        #endregion Fields
    }
}